Plug valve



ML NIELSON April 19, 1938;

PLUG VALVE Filed May 13, 1936 as W Mrtinfizson ATTORNEYS WITNESSPatented Apr. 19, 1938 UNITED STATES PATENT OFFICE Application May 13.

1 Claim.

The invention relates to a valve construction and more especially to aplug cock or valve.

The primary object of the invention is the provision of a valve, whereinthe valve plug will 5 be seated and to enable the easy operation of thevalve such plug will be automatically lifted from its seat to eliminatethe sticking of the plug in the opening and closing of the valve.

Another object of the invention is the provision of a valve of thischaracter, wherein the plug is turned in one direction for opening andclosing of the same.

A further object of the invention is the provision of a valve of thischaracter, wherein the plug will be prevented from leaking and isreadily and easily turned to opened or closed position as the necessityof lubrication of the plug is eliminated because when the valve plug isto be turned it will be automatically lifted from its 20 seat to avoidany sticking thereof.

A still further object of the invention is the provision of a valve ofthis character, which is comparatively simple in its construction,thoroughly reliable and efficient in its operation, as-

25 sured of uniform wear at the plug of the same,

readily and easily turned for opening and closing movements, strong,durable, and inexpensive to manufacture.

In the accompanying drawing:

vention.

Figure 2 is an exploded perspective view show-' ing the tensioningspring and adjuncts for the turning of the valve plug.

Figure 3 is an end elevation of the valve.

Figure 4 is a top plan view.

- Similar reference characters indicate corresponding parts throughoutthe several views in the drawing.

Referring to the drawing in detail, the valve comprises a shell or bodyIIi which can be formed by casting in the well known manneror be formedby .forging, pressing or stamping operations. Preferably the body is oirectangular shape although it may be otherwise shaped. At opposite sidesof the body are circular flanges II having internally threaded aperturesI2 opening into a central machine tapered compartment or chamber I 3provided with accurately machined or ground seats I4 and I 5,respectively, which" are. adapted to engage the rotatable plug or cockmember I6 formed with the central way II. On the turning of the plug orcook member I8 55 the way I! is opened or closed and when opened isFigure 1 is a vertical sectional view through a valve constructed inaccordance with the 'in- 1936, Serial No. 79,570

in alignment with the apertures I2 for the flow of fluid through saidplug or cock member. The chamber or compartment I3 opens through theupper side of the shell or body I and is closed bya cover plate Itbolted at I9 in place upon said body. This cover plate has a centralopening I9 for the inner enlarged circular portion 20 of a stemextending upwardly centrally from the plug or cook member I6.

Held between the body It and plate I8 are 10 packing diaphragms 2| and apacking ring 22, respectively, these being concentrically of theenlarged inner end of the stem for the plug or cock member I6 to assurea fluid tight connection of the plate I8 upon the body I0 and to 15avoid leakage about the said stem.

Mounted on the plate I8 is a split clamping piece 23 for swiveledconnection with the said plate I8 of a turning hub 24 which is providedwith internal screw threads 25 engaging external screw threads 25companion thereto and formed on the stepped portion 21 of thestem 28which has its outer end freely passed through a cap 29 threaded into theouter end of the hub 24. This cap 29 when threaded home in the hub 24 isheld secure by a suitable latch 30. The stem 28 is extended beyond thecap 29 and has fitted therewith a cross pin 3| which is indicative ofthe position of the plug or cock member I6 when in opened or closedpositions. 30

Secured to the cap 29 by fasteners 32 is a clutch ring 33, it havingdiametrically opposed notches 34 in its lower face while formed in thestepped portion 21 of the stem 28 are diametrically opposed notches 35,these notches .34 and 35 being 35 adapted to accommodate clutch lugs 36formed on the outermost coils of a coiled tensioning spring 31 which isconfined within a circular space 88 interiorly of the hub 24 between thestepped portion 21 of the stem 28 and the cap 29. This 4 springfunctions as a clutch for connecting the stem 28 with a turning hub 24.

The upper end of the hub 24 is externally squared to accommodate acenter socket portion 39 of a hand turning wheel 40 which is made secureupon the hub 24 by a wedging connection between the said hub and thecenter socket portion 39.

Normally the plug or cook member I6 is tight against the seats I4 and I5in its chamber I3 within the shell or body Ill. Now when the hand wheel40 is turned the spring 31 which is normally under a certain amount oftension when assembled within the valve mechanism will become furthertensioned in that when the wheel 40 is turned the hub 24 turns therewithand due to the screw threads internally of the said hub and externallyon the stepped portion 21 of the stem 28 the plug or cock member i8 willbe automatically lifted from the seats I4 and IE to eliminate anypossibility of the sticking o! the plug in the valve casing or shell I!)when the said plug or cock member is to be turned for the opening orclosing of such valve. When the wheel 40 is released the augmentedtension of.

the spring 31 will exert action upon the plug or cook member l6 causingit to moveto seating position against the seats l4 and I5 to eliminateleakage at these areas, the seating action by the spring W is slight asonly a small degree of movement is required to bring about the seatingof the valve to avoid leakage at the plug or cock member l6 within itsshell or body it).

As has been previously stated, the pin 3| on the stem 28 identifies orindicates the position of the plug or cock member 66 within the shell orbody ID, that is to say, whether such valve is opened or closed.

The plug or cock member i6 can not possibly stick to the seats H and I5therefor within the shell or body It! because the initial turning of thewheel 40 through the screw connection of the hub 24 with the stem 28eflects a lifting of the said plug or cock member l6 from the seats l4and I5 and on continued turning of the wheel 40 the valve can be openedor closed, this being brought about by the turning of such wheel in onedirection only.

Formed in the plate I! and opening through opposite edges thereof arepassages 4i, these opening into a cell, groove or channel 42 about theenlarged inner end portion 20 of the stem 28 for the plug or cook memberi 8, thereby enabling the escape or venting of anything that might passthe packing ring 22, as for example corrosive substance, viscous intoand around the elevating device that would cause binding and, excessivefriction, thus in this manner eliminating the latter.

The bottom end of the chamber I3 is closed by a slot bottom 43 to theshell or body l0 and this bottom has a cavity 44 to space the lower endof the plug or cook member 16 from said bottom to avoid any sticking atthat point of such plug or member. I

What is claimed is:

In a turn plug valve, a body having a chamber openingupwardly thereof, aplug valve seated in said chamber, a stem extending from the valve andhaving an enlarged inner end and a threaded outer end, a cover plate onsaid body for the chamber, packing diaphragms held between the coverplate and the said body for engagement with the valve about the enlargedinner end, a packing ring seated in the cover plate concentrically aboutthe enlarged inner end of the stem and active against the diaphragm, atubular hub swiveled on the cover plate and having internal screwthreads engaging the threaded outer end of the stem, a clutch ringseparably fastened in the outer end of the hub and having notches at itsinnermost side, the said threaded outer end of the stem being formedwith notches, and a coiled tensioning spring between the clutch ring andthe outer threaded end of the stem and having clutch lugs accommodatedin the notches in the ring and threaded end of the stem, respectively.

MARTIN NIELSON.

